Again consider the price comparison situation in which weekly expenses were compared at two chains-Miller's and Albert's. Recall that independent random samples at the two chains yielded the following weekly expenses:

Since the sample sizes are small, there might be reason to doubt that the populations of expenses at the two chains are normally distributed. Therefore, use a Wilcoxon rank sum test to determine whether expenses at Miller's and at Albert's differ. Use α = .05.

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Miller's $119.25 $123.71 Albert's $111.99 $116.62 $121.32 $122.34 $120.14$122.19 5121.72 $122.42 $123.63$122.44 $114.88 $115.11 $115.38 $114.40 $113.9 $111.87 $117.02 $116.89